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Found most commonly in these habitats: 9 times found in tropical dry forest, 1 times found in lowland rainforest, 2 times found in montane wet forest, 1 times found in old field/pasture, 2 times found in scrub veg., pasture edge, 1 times found in wet forest, 1 times found in edge of second-growth rainforest, 1 times found in mature wet forest, 1 times found in Primary forest and second growth habitats, 1 times found in rainforest, ...
Found most commonly in these microhabitats: 8 times Dry forest. In live branch Triplaris melaenodendron. OTS project on Triplaris co, 2 times Dry forest. I cut down a major trunk, the terminal 5m of a 7m tall Triplaris mel, pseudomyrmex viduus; ac times afternoon walk in evergreen riparian forest area. #3441, 1 times STR, 1 times Roadside veg., a Cordia alliodora tree, about 3m tall, had at least 4 ant coloni, 1 times live branch of Triplaris, 1 times in live stems Ocotea nicaraguensis, 1 times in durchbohrten zweigen von Sapium, 1 times forager, 1 times ex Triplaris, 1 times ex live branch of Sapium, ...
Collected most commonly using these methods: 8 times ex live Triplaris, 3 times search, 2 times Malaise, 2 times Nest in Triplaris, 1 times Nest in Triplaris (CSM2359), 1 times Sweeping, 1 times beating.
Elevations: collected from 5 - 1140 meters, 231 meters average
Type specimens: Holotype of Pseudomyrmex viduus: casent0902880; syntype of Pseudomyrma caroli: casent0907499; syntype of Pseudomyrma caroli sapii: casent0907500; syntype of Pseudomyrma triplaridis tigrina: casent0902881; syntype of Pseudomyrma ulei: casent0907567